Cheap Magnum Heads and some porting

Gives you some,info.While your at it,trim the valve guides down. Without that,and a good set of springs/retainers(Hughes 1110 come to mind.), your good to .510-.520" lift. Trim them should help another .030-.040.
http://www.forabodiesonly.com/mopar/showthread.php?t=90075&highlight=porting+Magnum+heads